Coupling for rubber fabric, and like hoses



Aug. 16, 1949.

c. c. s. u; CLAIR COUPLING FOR RUBBER, FABRIC, AND LIKE HOS E Filed Dec. 8, '1945 FIG. 1'. 1

V Inventor. cfiw/Lzzamadfi/mmruw La 62 AIR 2,. WJ22 ZJA Attorney.

rcou'pling;adapterorother device or apparatus. iioimsiadapted, to..be forged; to he hose li/Ianym'eth'ods of attaching-such hoses to-courrialgewhen ithefeut mismi -plings are knowm-such;-for-example,-as that in towardsgthe inner ferrule pd,

Patented Aug. 16, 1949 so a; tem

:COUJfLINGEQ Q BE EEABBIQ k Camille Clare Sprankling Le Clair, Acton, Londom Englan'd; assignor :toi flecalemit'v Limited, Brentford England, a tcorpanaltioneofgu Great niBnitain .raclaims. (01 235- 84) f 'lf'his invention relates -tocouplings,- adapters or atationsrintowhich; the metal (of the quter ferrple likef devices"(hereinafter ealled -couplings) -"of imambel-forced rafter the;=. ferru1es;.hfiileheemas- ,'the*=kind-'-whioh comprisesa ferruleat one end, --.sembled soas .toilooketheiferrules together. iilhe adapted to' be attached to ahose -of-rubber, fabric wellisofzthe ferrules. bounding itheisa d-leqf simfl :or bther flexible andrelativelycompressiblemabe formed with spaced longitudinal pr p'rp '-teri al, and---m ear 1s,- suchas a-ser-ewed shank, eprojections ror. withiiconiili ll l a ilp "whereby-=thepoupling-rnay-be attaohed-toanother helical-projections or 'th prpjeg o h "ing fitover a -tub'ular-ferrule andis then-clipped similar grooves, recesses or indentations. "to the'ferrule by'one or-more'circumferential-clips l a "'tightened by tangentscrews. S-uoh-means; howeever, are obieetionable; in that the tightening screws are elumsy'andessentially asymmetrically disposedsd-thatthey constitute-prey ections from pllng;

*theoircularform- 'oflthe coupling whioh maybe a, Fig. 2 is an end view of the coupling if and danger to theusers -hands. Fiirther,such clips Fig. 3 is a fragmentary sectional view; o al l enare liable tmbreak'and-to be-lost. jarged sgale of the opupling showing; lthe prol he -object of this" inve'ntion --therefore -is to .5 inarisls s eseas n thetinn ierru eia ferrules may be formed with a number of spaced er ferrulesh heferr g t the. drawin s: The tal provide improved couplings and improved methods for attaching couplings-to hoses. mscQrdineo-the esenti t oni ah e pling ischa'racterised by thefeature. that it-e-is made in at least two parts, one of which consists of an outer- -ferrule-andthe other of-a-n inner ferrule, (which forms the fluidrfiow conduitl which m e di o e t e om ete minei s to gpeovide-rtbetween them audi -over part oi; -their fzlength anannular recess in which the endwofthe 141395 efi i dlt c f rri ai. mine rm wi a groove, recess or indentation or with a ni1mber f Spaced grooves, recesses or indentations cylindrical portion 6 which is knurled externally int hich the material of the hose can be forced o and is of diameter equal to or slightly less than in 8 .3 that the hose Shall be firmly gripped in the bottom of the thread on the intermediate part 4. The remainder of the inner ferrule forms a the coupling. As an alternative, however, both p g 1 which is of less diameter than the Said knurled portion 6 and its tip 8 is rounded to facilitate the easy entry of the spigot into the hose. The spigot is also formed externally with a number of spaced circumferential rings or ridges 9 and the inner end of the spigot is radiused at ID to meet the said knurled portion.

protuberanoes adapted to be forced into the material of the hose.

The two ferrules are made separately and are assembled to form the coupling cooperating means being provided on or in the ferrules where by the inner ferrule can not only be fixed firmly The metal outer ferrule I i is hollow and o v r within the i l but after assembly can the greater part of its length it is formed as a also be locked m posmon' relatively thin sleeve 12 which is spirally serrated The Outer ferrule for example m internally at I3 and is integral with an end part a Sleeve integral Wlth an end part Whlch IS I 4 which is formed externally with flats so that screwed internally to receive an externally it may act as a nut and receive a, Spannen This threa intermediate part the inner ferrule end part is screw-threaded internally to receive these two parts DrOVidmg the Inner closed end of the external thread on the intermediate part 4 ,the Said a n a recess which is formed between of the inner ferrule and it is of such a length that the outer and inner ferrules. A portion of the when the ferrules are assembled, a part of the inner ferrule within the outer ferrule may also th d surrounds the knurled part 6 of the inner be formed externally with serrations or indenferru1e in assembling the two ferrules, the inner ferrule 5 is screwed into the outer ferrule ll until the shoulder 5 on the inner ferrule abuts against the face of the nut portion I4 of the outer ferrule. When the ferrules are thus assembled, the tip 8 of the spigot part I of the inner ferrule projects slightly out of the sleeve part [2 of the outer ferrule. The end of the hose is engaged over the tip of the spigot part of the inner ferrule and is then pushed over the spigot part right home to the bottom of the annular space between the ferrules.

The sleeve part l2 of the outer ferrule is then swaged inwards, e. g., by means of split dies or a roller device. This swaging operation not only crushes the serrations in the sleeve part 12 of the outer ferrule into the material of the hose thereby also crushing the hose on to the rings or ridges 9 on the spigot part 1 of the inner ferrule, but it also crushes the tops of those threads in the threaded end part of the outer ferrule which surround the knurled part 6 of the inner ferrule into the serrations of the knurled part andthus provides a lock to prevent the two ferrules becoming unscrewed.

The separate circular rings or ridges 9 on the inner ferrule may, if desired, be replaced by one or more helical serrations and correspondingly the internal spiral protuberances in the sleeve part of the outer ferrule may be replaced by separate circular rings or ridges, like the rings or ridges 9.

In a modification the knurled part 6 of the inner ferrule may also be formed adjacent to the said shoulder 5, the metal of the outer ferrule an integral intermediate part externally threaded to fit said internally threaded portion of the outer ferrule and an integral shank part adapted to use as a connecting element, said outer and inner ferrules being proportioned for assembly in coaxial relationship with the spigot part of said inner ferrule within and radially spaced from the sleeve portion of said outer ferrule and. with said threaded part and threaded portion screwed together, said inner ferrule having a generally axially serrated portion adjacent the inner end of the externally threaded part thereof, and said internally threaded portion of the outer ferrule overlying and being reduced in section at a position adjacent said serrated portion when the ferrules are screwed together, so that externally effected and inward radial deformation of the outer ferrule adjacent the position of said serrated portion forces some threads of the outer ferrule into engagement with the serrations to lock the two ferrules in their assembled positions.

2. A hose coupling comprising, in combination, a hollow outer ferrule having a relatively thin sleeve portion and an internally threaded integral end portion, a hollow inner ferrule which serves as a fluid flow conduit and includes a spigot part, an integral intermediate part externally threaded to fit said internally threaded portion of the outer ferrule and an integral shank part adapted to use as a connecting element, said outer and inner ferrules being proportioned for assembly in coaxial relationship with the spigot part of said inner ferrule within and radially spaced from the sleeve portion of said outer ferrule and with said threaded part and threaded portion screwed together, the inner surface of said sleeve portion of the outer ferrule and the outer surface of said spigot part of the inner ferrule each having at least one recessed portion therein into which hose material is forced by radial pressure when assembled therebetween, one of said ferrules having a generally axially serrated portion in position to face a part of the threads of the other when the ferrules are screwed together, so that externally effected inward deformation of one ferrule toward the other effects engagement of the threads and axial serrations to lock the ferrules in their assembled relationship.

CAMIILE CLARE SPRANKLING LE CLAIR.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENT 

